linux-kernel - Re: [RFC GIT PULL] sched; Fix a few missing rq clock updates

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Message-ID: <20130514115733.GG15942@dyad.programming.kicks-ass.net>
Date:	Tue, 14 May 2013 13:57:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>, Mike Galbraith <efault@....de>
Subject: Re: [RFC GIT PULL] sched; Fix a few missing rq clock updates

On Fri, Apr 12, 2013 at 01:50:57AM +0200, Frederic Weisbecker wrote:
> Hi,
> 
> So I revisited the rq clock series I had for dynticks. The patches
> actually were about upstream issues so I refactored the fixes
> under that angle and gave up with the wrong asumption that rq
> clock relies on the tick for its updates.
> 
> Patches 1-4 fix some missing updates. Additionally I removed
> 2 of these updates from the previous set:
> 
> * No need to update the rq clock on idle_balance() because it should
> follow a call to deactivate_task() (unless TIF_NEED_RESCHED is set
> on idle without new task on the runqueue, not sure we want to cover that).
> 
> * No need to update for try_to_wake_up_local() -> ttwu_do_wakeup() -> check_preempt_curr()
>   as it's following deactivate_task().
> 
> Patch 5 brings accessors that will be necessary to settle an rq clock
> debugging engine. What remains is to tag scheduler's entry/exit points
> and report missing or redundant update_rq_clock() before calls to
> rq_clock() and rq_clock_task().

Just noticed this queue was still sitting in the INBOX, I took it and will
soon-ish hand to Ingo.

Thanks!
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